日本生理学会大会発表要旨集
日本生理学会大会発表要旨集
セッションID: 2P098
会議情報
Neurons & synaptic functions
シナプス小胞貯蔵プール(RP) と放出可能プール(RRP)はカルシニューリンによって異なる制御がなされる
松井 秀樹熊代 進富澤 一仁松下 正之魏 氾研陸 雲飛
著者情報
会議録・要旨集 フリー

詳細
抄録
The synaptic vesicles keep recycling by the processes of endocytosis and exocytosis to maintain the normal synaptic transmission. The synaptic vesicles are classified as the readily releasable pool (RRP) and the reserve pool (RP). In the endocytosis process, calcineurin (CaN), a Ca2+/calmodulin-dependent protein phosphatase, has been shown to play important roles. However, it is unclear about its roles in different vesicle pools. Here, we investigated the role of CaN in the regulation of vesicle recycling in the RRP and RP. Vesicle recycling was monitored by using fluorescent dyes FM1-43 and FM4-64 in the primary cultures of hippocampal neurons. Inhibition of CaN by FK506 and cyclosporin A suppressed the endocytosis in the RP, but not in the RRP. Inhibition of CaN also restrained the exocytic process triggered by 10 Hz stimulation, but had no effect on 3-5 Hz stimulation-induced exocytosis. FK506 also reduced the total vesicle pool size in the synaptic terminals. A synthesized CaN inhibitory peptide showed the similar effects as FK506 and cyclosporin A. These results revealed a novel mechanism that CaN plays critical roles in the distinct vesicle recycling processes. [Jpn J Physiol 55 Suppl:S147 (2005)]
著者関連情報
© 2005 日本生理学会
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